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In wireless telecommunications, roaming is a general term referring to the extension of connectivity service in a location that is different from the home location where the service was registered. Roaming ensures that the wireless device is kept connected to the network, without losing the connection. The term "roaming" originates from the GSM (Global System for Mobile Communications) sphere

When we talk about in general term roaming is referring to the extension of connectivity service in a location that is different from the home location where the service was registered or you can say using cellular phone outside of carriers limited service area or Home calling area is known as roaming.